I've become quite adept at pin sharing. :-)

Thanks for the confirmation.

The basic premise is what I was asking about - whether having AN5 used 
means I have to set AN4-0 as analog as well (even temporarily in the 
subroutine).

Pin sharing aside, I think you confirmed that is true.

So, getting into sharing, not only would I have to consider what is 
connected to AN5, but also perhaps AN4-0 if the circuit cannot be left 
floating while AN0-4 are defined as analog inputs.

Joe M.

ivp wrote:
>> Am I reading the PIC 18F4520 docs correctly that you can only
>> assign analog inputs in ascending order?
> 
> Yes. Some are not like that, and you can assign any individual pin as
> an analogue input on its own
> 
> Depending on the circuit, you should be able to temporarily switch
> from outputs to inputs if the pin is not left floating. For example if
> you want AN5 to be the analogue input and PORTA <4:0> are in
> use as outputs, you set PORTA <5:0> as inputs in TRISA and
> ADCON1 <3:0> = 1001 to configure AN <5:0> whilst you select
> and read AN5 (ADCON0 <5:2> = 0101)
> 
> wbr
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